Organocatalytic Isomerization/Allylic Alkylation of <i>O</i>-Acylated Hemithioacetals and Their Application in Tandem Sequence to Access 2,7-Dioxabicyclo[2.2.1]heptan-3-one Derivatives
作者:Huan-Qing Zhang、Ji-Ming Xi、Wei-Wei Liao
DOI:10.1021/acs.joc.9b03172
日期:2020.1.17
preparation of α-hydroxy allylic thioesters via a Lewis base-catalyzed tandem isomerization/allylic alkylationprocess is reported. The resulting allylic thioesters can serve as valuable scaffolds to undergo a stereoselective intramolecular cyclization to deliver 2,7-dioxabicyclo[2.2.1]heptan-3-one derivatives in a catalytically atom-economic fashion.
Enantioselective Organocatalytic Rearrangement of α-Acyloxy- β-keto Sulfides to α-Acyloxy Thioesters
作者:Francesca Capitta、Angelo Frongia、Pier Paolo Piras、Patrizia Pitzanti、Francesco Secci
DOI:10.1002/adsc.201000376
日期:2010.11.22
The first highly enantioselectiveorganocatalyticrearrangement of α-acyloxy-β-keto sulfides to α-acyloxy thioesters has been developed which provides a number of important synthetic building blocks in high yield and with excellent enantioselectivities (ee: up to 92%).
A facile and efficient protocol for the α-benzoyloxylation of β-keto sulfides is presented. This methodology provides a step-economical, mild and practical access to highly functionalized α-O-benzoyloxy substituted β-keto sulfides, including those with quaternary carbons, which are not easily obtained through currently available methods.
The present invention is related to chemical compositions, processes for the preparation thereof and uses of the composition. Particularly, the present invention relates to compositions that include substituted biaryl-methanesulfinyl acetamides of Formula (I):
wherein Ar, Y, R
1
, R
2
, R
4
, R
5
, q and x are as defined herein; and their use in the treatment of diseases, including treatment of sleepiness associated with narcolepsy, obstructive sleep apnea, or shift work disorder; Parkinson's disease; Alzheimer's disease; attention deficit disorder; attention deficit hyperactivity disorder; depression; or fatigue associated with a neurological disease; as well as the promotion of wakefulness.